Bathtub



FIG. 1: is a side perspective view of the bathtub showing my new design;

FIG. 2: is a front elevation view thereof;

FIG. 3: is a rear elevation view thereof;

FIG. 4: is a top plan view thereof; and,

FIG. 5: is a side elevation view thereof (the opposite side being a mirror image). 

The ornamental design for a bathtub, as shown and described. 